期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 108, 期 3, 页码 665-669出版社
SPRINGER
DOI: 10.1007/s00339-012-6948-9
关键词
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资金
- National Basic Research Program of China [2012CB933101]
- National Natural Science Foundations of China [11144008]
A new planar anisotropy Sm2Fe14B nanocrystal as an electromagnetic absorption material was prepared by melt-spinning method. The electromagnetic and microwave absorbing properties of Sm2Fe14B nanocrystal/nonmagnetic matrix composite in the frequency range of 0.1-10 GHz were measured and calculated. At the perfect matching point (2.9 GHz), the minimum reflection loss reaches -42.0 dB at the matching thickness of 3.1 mm. Furthermore, the calculation shows that the normalized input impedance Z (in)/Z (0) equals 1, but the modulus of the ratio between the complex permittivity and permeability |epsilon/mu| is far away from unity at the perfect matching point. The effective permeability of the composite was simulated using the combination of the Landau-Lifshitz-Gilbert equation and Bruggeman's effective medium theory; the agreement between the experimental data and the theoretical one demonstrates that the magnetic loss in the composite is mainly caused by natural resonance.
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